linux-kernel - Re: [PATCH] arm: kprobe: replace patch

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Message-ID: <20161201141138.css266nzcutzfapw@linutronix.de>
Date:   Thu, 1 Dec 2016 15:11:39 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Yang Shi <yang.shi@...aro.org>
Cc:     linux@...linux.org.uk, rostedt@...dmis.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rt-users@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] arm: kprobe: replace patch_lock to raw lock

On 2016-11-10 16:17:55 [-0800], Yang Shi wrote:
> 
> Since patch_text_stop_machine() is called in stop_machine() which disables IRQ,
> sleepable lock should be not used in this atomic context, so replace patch_lock
> to raw lock.

I am taking this one. Thank you.
We have jump_labels() deactivated on ARM because stop_machine() may
cause latencies at runtime. kprobe and kgdb is used by the user on
purpose (and not because he changed some sched setting) I think we are
fine. I am going to document this.

> Signed-off-by: Yang Shi <yang.shi@...aro.org>

Sebastian